Drill.



.I. MOFFITT.

DRILL.

APPLICATION FILED JAN. 9, 19:5.

1222,5590 Patented Apr. 10, 191?.

2 smans suzsr l-nggmnu I? i l WlT/VESSES: g

-J. MOFFITT.

DRILL.

APPLICATION FILED JAN.9. 1915.

"MI mwm U lz/illllfl/ll Patented Apr. 10, 1917.

2 SHEETS-SHEET 2 WITNESSES: 4Z%% cally positioning pisrrnn srarnsrarnnir opinion JEREMIAH IVIOFFITT, OF SOUTHBRIDGE, MASSACHUSETTS,ASSIGNGR T0 AMERICAN OPTICAL COMPANY, OF SOUTHBRIDGE, I /IASSAGHUSETTS,A VOLUNTARY ASSOCIA- TION OF MASSACHUSETTS.

DRILL.

Specification of Letters Patent.

Patented Apr. Ill 1917.

Application filed January 9, 1915. Serial No. 1,437.

To allv whom it may concern:

Be it known that I, JEREMIAH h lorrlr'r, a citizen of th United States,residing at Southbridge, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inDrills, of which the following is a specification.

This invention relates to improvements in drills and has particularreference to an improved machine for use in the drilling of ophthalmiclenses or the like.

The leading object of the present invention is the provision of animproved drill for ophthalmic lenses in which all desired adjustmentsmay be made of the position of the lens and which shall embody improvedlens holding and lens positioning means, and in which at the same timeall of the parts shall be of the most simple and durable con str'uctionwhich will permit of the attainment of the desired result.

Among other specific objects of the present invention may be mentionedthe provision of an improv d device for automatithe lens to insure theproper supporting of the same immediately beneath the point of the drilloperating thereon; the provision of improved mechanism for operating thelens centering and clamping device and for operating the frame controlwhereby the various parts may be readily positioned with one hand; theprovision of improved means for feeding nielange or drilling fluid tothe point of the lens to be operated upon; and in general thesimplification and perfectipn of the mechanism of ophthalmic lensdrills.

Further objects and advantages of this improved construction should bereadily apparent by reference to the following specification taken inconnection with the accompanying drawings forming a part thereof, and itwill be understood that may make any modifications in the specificdetails of construction shown and described within the scope of theappended claims without departing from or exceeding the spirit of thisinvention.

Figure I represents a perspective view of a drill, the usual parts ofthe construction being shown in ghost-line.

Fig. II represents an enlarged detail view of the lens holding andpositioning means.

Fig. III represents a fragmentary view partially in section illustratingthe means for locking the standard of the lens carriage or holder inposition.

Fig. IV represents a sectional view with the parts illustrated in Fig.II moved into position for drilling of the lens.

Fig. V represents a fragmentary sectional view of the outer portion ofthe lens supporting arm and standard illustrating certain details ofconstruction thereof.

Fig. VI represents an end view of the im proved drill.

Fig. VII represents a sectional view as on the line VII-VII of Fig. VI.

Fig. VIII represents a detail view of a modified form of melange tankremoved.

Fig. IX represents a sectional view of the means for locking the lensholder in angularly adjusted position, and

Fig. 1 represents a top plan view par tially in elevation and partiallyin section of the lens centering and clamping mechanism.

In the drawings, in which similar charactors of reference are employedto denote corresponding parts throughout the several views, the numeral1 designates the base of the drill provided with a peripheral upstandingtlange 2 to form a tank and prevent spreading of any melange onto thework table. Rising from the base 1 at the rear and near one cornerthereof is the standard 3 having the journal bearing 41: for the drillspindle 5 and the slide bearing 6 in which moves the sleeve 7 providinga second bearing for the said drill spindle. A handle 8 pivoted to thestandard 3 and having a yoke 9 engaging the sleeve 7 serves to impartreciprocating movement to the sleeve and thus to the drill spindle, aspring normally nolding the parts in raised position, as shown in I,while to actuate the spindle 5 there is secured thereon the pulley 10,adapted to receive a belt which may if desired be further passed overthe idlers 11 and. 12, which are supported by the bracket 13.

Attention is invited to the fact that the bracket 13' is so secured tothe upper end of the standard that it may be located in either of twopositions. One of these positions is indicated in Fig. l, as where it isdesired to belt to the drill from over head, while the opposite positionis illustrated in Fig. VI, as where it is desired to belt to the drillfrom beneath the bench.

Rising from the base 1 adjacent the standard is a tubular lug 1%, whichpreferably projects above the top of the flange 2 and has mountedtherein the guide 15, on which is mounted the sleeve 16 having thedepending peripheral flange 17 interlocking with the lug 1st to form ashield divert-ing melange from the lug and having at its upper end thepivot-bearing block 18 engaging the upper end of the guide 15 wherebythe sleeve 16 is supported for free rotative movement around the guide15 and lug 1 1.

Secured to the flange 17 is a blade spring 19 bearing at its upper endthe stop block 20 adapted to engage the edge of a lens, said bladeextending through the guide slot or groove 21 of the lug 22 at the upperportion of the sleeve 16 and a thumb screw 23 serving to bring the bladeinward to hold the stop block 20 at any desired position relative to thecone point 24; which is located at the upper end of the sleeve and inaxial alinement with the point of the drill 25, and serves when in useto support the inner end of the lens during the drilling operation.

Rising from the opposite end from that at which the standard 3 islocated, is the large lug 26 centrally bored to receive and rotativelyengage the cylindrical base 27 of the lens carriage standard 28 whichprojects downward through the portion 26 and is retained in position bythe countersunk washer 29 secured in position by the screw 30 and lockedto rotate with the standard 28 b the pin or pins 31, as is clearlyillustrated in Fig. V.

Mounted on the portion 27 and resting on top of the lug 26 is theindicating or scale ring 32 locked in desired adjusted position eitherby dowels, or, as is shown in Fig. V, by a set screw or set screws 33,so arranged that the ring 32 may be set in any desired position andthere secured. This permits of adjustment of the ring to compensate forany wear in the parts of the machine.

The upper portion of the standard 28 is eccentrically bored to receivethe spindle 31 of the swinging lens carriage. Said carriage comprisesthe section from which the spindle 3% depends, and the angularlyadjustable section 36 bearing the lens holding and clamping mechanism.

In the drilling of ophthalmic lenses it is frequently desirable that thesame be drilled to one side or the other of their longer geometricalaxis in place of directly on the axis, and it is for this reason thatthe spindle 34: is eccentrically located relative to the axis ofrotation of the standard 27 hen it is desired to drill a lens to oneside or the other of what is usually termed the center or longergeometrical axis, it is merely necessary to press downward on the latch37 to release the standard 28, when grasping base 1, preferably at the,

of the handle 38 facilitates rotation of the standard to bring thepointer or guide designation 39 in alinement with the propereonliguration 10 on the scale ring This movement serves to vary thecenter of pivotance of the lens supporting carriage by moving it eitherinward or outward, as will be readily apparent, and this willconsequently vary the position of the lens relative to the drill theamount indicated by the configuration 10.

In the drilling of the lens, however, it is desirable to determine notonly the position at which the drilling operation will take place, butalso to have the lens so'mount-ed that the drilling will be normal tothe surface of the lens irrespective of its curvature. It is toaccomplish this result that the carriage section 36 is pivotallymounted, the axis of the pivotal movement of the carriage for angularadjustment of the lens passing substantially through the point at whichthe drill will engage the surface of the lens so that adjustment of thelens to the correct angle will in nowise vary the portion of the lens tobe engaged by the drill.

Various means may be employed for securing the carriage in desiredangularly justed position, one form being illustrated inFig. V and asecond form in Fig. 1X, these being capable of either joint or separateuse.

Referring particularly to Fig. V, 1 have shown the carriage 36 asprovided with the spindle n passing through the carriage section 35 andhaving a reduced end 12 around which is coiled the compression spring e3bearing against the interior shoulder 14: of the carriage section 35 andhaving its outer end bearing against the washer 15 which is secured tothe end of the spindle 4:1 as by the screw 16, the washer being lockedto retate with the spindle 11 as by the pin l7. It will thus be seenthat the action of the compression spring on the washer -15 serves todraw the contacting faces as and 4:9 of the two carriage sections intotight frictional engagement, which will permit of relative angularadjustment of the parts against said friction, the friction, however,being sufficient to retain the parts against any accidental relativemovement.

If preferred, however, in place of or in addition to this friction, Imay mount within one of the sections, as in the slot 50 of the carriagesection 36, the latch member 51 actuated by the spring 52 to swing thelatch portion 53 thereof into one of the notches 5 1 in the face 18 ofthe carriage section 35, a plurality of these notches being formed insaid face 48 so that the section 36 may be secured in any desiredposition within practical limits.

To retain and properly center the lens on the swinging carriage, variousmecha- '1 317 new nisms may be employed. 1 have here illus trated,however, a preferred mechanism for this purpose, in which there issecured to the carriage section 36 the plate or table 55 having theguide rib 56 thereon, in which is formed a slot 57 for the screw 58which serves to retain in position on the table 55 the clamp slide 59,while permitting of sliding movement thereof, which movement is limitedby the engagement of the screw 58 with the ends of the slot 57. Thetable has the forward portion thereof centrally cut away, as indicatedin Fig. X, and bears at its forward end the lens engaging pins 60provided intermediate the length thereof with the shoulder 61 to engagethe under surface of the lens, the slide being provided with a pair ofshorter "pins 62 for engaging the sides of the lens at the opposite endthereof, as is clearly indicated in Figs. TI and TV. The slide itselfmay either be grasped by the hand and rearwardly shifted against thetension of the spring or springs 63, as is indicated in Fig. I, or maybe provided at one side with the rack 64 engaged by the sector 65 on thepivoted lever 66, so disposed that the end of the lever may be engagedby the thumb when the hand is grasping the carriage section 36, pressureof the thumb serving to move the slide outwardly to permit of correctpositioning of a lens between the pins 60 and 62.

By reference particularly to Figs. 11 and TV, one of the greatadvantages of my improved work holder and work supporting pin will bereadily apparent, and it will be noted that when a lens is placed inposition between the pins 60 and 62 with its inner end resting on theshoulder 61, that said shoulder serves to hold the end of the lens in.alinement with the conical work support 24 but beneath the point of thecone. Inward swinging of the carriage on the spindle 3% as a pivot willserve to press the end of the lens against the inclined surface of thecone, when the lens will ride up off the shoulder 61 and in finalposition will have its end against the strap block 20 and will be firmlyand securely supported by the point of the cone 24: immediately beneaththe place to be drilled, which thus provides a firm rest and base forthe lens.

The advantage of this construction should be at once apparent since itwill be seen that irrespective of the shape or curvature of the lenswhether the same be concave or convex, in place of its being necessaryto specifically adjust a number of parts to secure the correctsupporting of the lens beneath the pivotal point to relieve the lens ofstrain and prevent breaking thereof, it is merely necessary to clamp thelens in position on the bed 55 preferably swinging the carriage section36 to get approximately the desired move the angle for the lens and tothen on the point of the cone,

1 and Fig. VII, the valve point inward around the pivot till the lens isagainst the strap 20, when in all instances the cone will serve to raisethe lens out of engagement with the shoulder 61 so that the lens will besecurely supported while at the same time held properly centered by theengagement of the pins 60 and 62 with the thereof.

In the drilling of lenses it is necessary to make use of a drillingfluid usually termed melange. In some instances persons prefer anautomatic melange feed, while in other instances it is desired to have amanually operated and controlled melange feed. To take care of thevarying require ments of different users of my machine I have,therefore, designed interchangeable manual and automatically operablemelange feeding devices. Said devices comprise a cylindrical drawn orcupped up tank 67 having secured at one side thereof the interiorlythreaded sleeve 68, adapted to lit into a recess or socket inthe-portion 6 of the drill and be there suitably secured by a bolt orthe like. This tank in both the manual and automatically operable form,has passing through the bottom thereof the bushing 69 interiorlythreaded to receive the threaded lower end of the tube 70, in which isslidably mounted the valve pin 71 having the tapered valve 72 at itslower end, from which depends the guide wire 73 for the melange, andhaving intermediately thereof the abutment shoulder 74. The compressionspring 75 surrounds the valve pin 71 and has one end resting on theshoulderie and the other end bearing against the pin 76 driven throughthe valve stem and riding in the slot 77 at the upper end of the tube. Atap '78 forms a closure for the upper end of the tube and a guide forthe valve rod which extends thereabove.

In the automatic form illustrated in Fig.

stem projects up- 'ardly sufficiently to engage the abutment 79 carriedby the arm 9 of the handle 8, whereby the handle 8 serves to temporarilydepress the valve stem 71, which then springs past the abutment 79 toallow the valve to close before the drill comes into engagement with thework, a portion of melange flowing through the aperture 80 at the baseof the tube 70 down around the valve 72 and being guided into correctposition on. the work by means of the wire 73.

In the manually operable form of con struction the parts aresubstantially the same, with the exception that the tap 78 has risingtherefrom the ear or cars 81 between which are pivoted one end of thebell crank 82 which depends over the front of the tank whereby slightpressure against the end of the bell crank serves to depress the valvestem and open the valve,

the spring serving to close the valve and stop the flow of melange assoon as the pressure is removed from the bell crank lever 82.

From the foregoing description taken in connection with the accompanyingdrawings the construction of my improved drill should be readilyapparent. Briefly stated, the operation may be considered as follows:When it is desired to drill a lens it is first determined whether thelens is to be drilled above or below center and the distance from theedge of the lens at which the hole is to be drilled. The screw is thenturned to bring the block 20 in correct position according to thedistance from the edge at which the hole is to be drilled, while thelatch 37 is depressed and the standard 28 rotated to correct position todrill the lens on, above, or below center, as may be de sired. Thecarriage 36 is then grasped with the left hand, the lens if desired alsobeing grasped by said hand. The lens being suitably held as with one endresting on the shoulder 61 of the pin 60 and the small and third fingersof the hand resting on the carriage 36 with the other fingers holdingthe lens, the thumb is then pressed against the lever 66 to open up theslide to such position that the lens will fit between the pins 60 andG2, the lens being then pressed downward into position, and the centralportion of the slide being hollowed as at 83 to accommodate strongconvex surfaces. The swinging carriage now being held by the left hand,it is merely necessary to either angularly adjust the same against thefriction of the spring 43 or to engage the outer end of the latch 51with one of the fingers to release the latch till the carriage is swunginto desired position.

The carriage 36 is then swung inward, the lens sliding upward on thecone point at and if desired being steadied by the forefinger toproperly hold the same down onto the point of the cone. Grasping of thehandle 8 by the right hand then serves to move the drill 25 downwardtoward the lens. Melange may be placed on the point of the lens to bedrilled either by pressure of the thumb of the left hand on the bellcrank 82, in the case of the manually operated melange feed, or byengagement of the abutment (9 with the upper end of the valve stem asthe drill. is depressed, in the case of the automatic feed, in eitherevent a portion of the melange being released flowing down along thewire 73 to the lens. It is then merely necessary to supply suitablepressure to the rotating drill through the medium of the handle 8 untilthe lens is drilled part way through, when the same may be turned overand the drilling operation completed.

I claim:

1. In a machine of the character detion of the lens in the holder,

scribed, the combination with a lens holder, of a lens positioning pinhaving a conical surface projecting above the normal posiwhereby whenthe holder is moved toward the pin the lens will ride upward on saidconical surface and be correctly supported in operative position on theapex of said cone.

2. In a machine of the character de scribed, the combination with a baseand a drill carried thereby, of a work supporting post disposed in axialalinement with the drill and having. an inclined front surface, a workholder movable toward said post, lens rests on the holder at a pointlower than the upper edge of the inclined surface,

said means allowing relative upward movement of the lens, whereby whenthe holder is moved inwardly the inclined surface will cam the lensupward into position to rest on the highest point thereof, substantiallyas and for the purpose described.

' 3. In a machine of the character described, the combination with abase and a drill supported thereby, of a work support mounted forrotative movement about the axis of the drill, an adjustable stopcarried by the support for engaging the edge of the lens, a lens holdermounted for swinging movement toward and away from the work support, andmeans for laterally shifting the swinging lens holder, of the worksupport and stop permitting the same to automatically accommodate itselfto the edge of the work or lens irrespective of the lateral adjustmentof the latter.

4. In a machine of the character described, the combination with a baseand a drill supported thereby, of a lenscarriage standard rising fromthe base, a lens carriage pivotally engaging the standard and providedwith a work supporting bed, lens retaining pins rising from the bed andprovided with shoulders on which a lens may rest, a clamp slide mountedon the bed, means for forcin the slide into operative position, and rackand sector mechanism for shifting the clamp slide into inoperativeposition.

5. In a lens drill, the combination with a base and a drill supportcarried thereby, of a drill carried by the support, a pivotally mountedstandard rising from the support,

means for locking the standard in desired i rotatably adjusted position,and a lens car riage pivotally mounted on thestandard eccentric to theaxis thereof, whereby rotation of the standard serves to laterally shiftthe carriage to regulate the operative position of the drill relative tothe major geometric axis of the lens operated on thereby.

6. A lens drill, including a lens carriage standard, a sectionalcarriage supported by the standard, means connecting the sections thepivotal mounting serves to laterally shift of the carriage for relativepivotal movement to adjust the angular position of the lens, and aresilient latch carried by one of the members of the carriage andadapted to engage in one of a plurality of keepers in the other memberfor securing the parts in desired relatively adjusted position.

7. In a lens drill, the combination with a base and drill supportcarried thereby, of a standard rotatably supported by the base, meansfor locking the standard in desired rotatively adjusted position, acarriage section eccentrically pivoted on the standard whereby rotationof the main standard the carriage section, a lens carriage pivotallysecured to the carriage section and laterally adjustable therewith, andmeans for locking the carriage in desired angularly adjusted position.

8. In a lens drill, the combination with a base and drill supportcarried thereby, of a lens carriage standard rising from the base, alens carriage pivotally secured to the; standard, and means for holdingthe carriage and standard in frictional engagement one with the other toresist accidental relative pivotal movement of said parts.

9. In a lens drill, the combination with a base having a socket formedtherein, of a standard having a portion rotatably mounted within thesocket, a vernier collar e11circling the standard and keyed to the base,means on the standard for cooperation with the Vernier to indicate theseveral adjustments of the standard, and means carried by the base andengaging the standard for locking the standard in desired rotativelyadjusted position.

10. In a lens drill, the combination with a base, of a drill standardand a lens carriage standard rising therefrom, a lens carriage supportedby the lens carriage standard, a lens clamp slide mounted on thecarriage, and a thumb piece pivoted to the carriage and engaging theslide for shifting the slide into inoperative position upon pressure onthe outer end of the thumb piece.

11. In a lens drill, the combination with a base, of a standard risingtherefrom, a lens carriage pivotally secured to the standard and bearinga lens clamp slide, a latch member for controlling the relativeadjustment of the carriage and standard, and an operating lever forcontrolling the movement of the clamp slide, said parts being disposedat opposite ends of the carriage, whereby they may be simultaneouslyoperated by natural grasping of the carriage with the hand or may beindependently operated as desired.

12. In a lens drill, the combination with a base, of a standard risingtherefrom, a lens carriage pivotally secured to the standard and bearinga lens clamp slide, a latch memher for controlling the relativeadjustment of the carriage and standard, and an operating lever forcontrolling the movement of the clamp slide, said parts being disposedat opposite ends of the carriage, whereby they may be simultaneouslyoperated by natural grasping of the carriage with the hand or may beindependently operated as desired, the said pivotal movement of thecarriage serving to vary the angular position of the lens, and means forlaterally shifting the standard and carriage to vary the horizontalposition of the lens with respect to the drill.

13. In a lens drill, the combination with a base and a drill standardrising therefrom, of a lens carriage supported by the base for movementtoward and away from the drill holder, a lens supporting pin disposed inadvance of the drill holder and provided with an upwardly incliningforward face, and lens positioning pins on the lens carriage having lensreceiving shoulders on which the lens will normally rest, the shoulderson the pins adjacent the lens support being lower than the top of thesupport, and the shoulders on the distal pins being substantially thesame height as the support when the carriage is in horizontal position,whereby as the lens carriage is moved in the direction of the supportthe inclined front face of the support will cam the lens up- Ward oilthe lower shoulders to be supported in substantially horizontal positionon the top of the lens support, and the distance shoulders while heldcentered on the carriage by continued lateral engagement of the pinswith the edge of the lens.

14. In a lens drill, the combination with a base having a drill standardand a conical pointed lens support rising therefrom, of a lens carriage,a pivotally supported arm for supporting said carriage, means forlaterally shifting the point of pivotance of the arm to laterally adjustthe lens carriage relative to the conical lens support, and lenscentering pins carried by and projecting upwardly from the lenscarriage, said pins having shoulders for initially supporting the lensat a point below the top of the conical lens support, whereby as thecarriage is swung toward the conical support on its pivot the supportwill cam the lens upwardly 0d the supporting shoulders to rest firmly onthe point during the drilling operation, substantially as and for thepurpose described.

In testimony whereof I aflix my signature in presence of two witnesses.

JERRY MOFFIT'I.

Witnesses:

HARRY H. STYLL, C. FRED HILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. 0.

